[Swan-commit] Changes to ref refs/heads/master

[D. Hugh Redelmeier]

New commits:
commit fff2f721ad6f56812bf01cf63c4a6c646f8342ba
Author: D. Hugh Redelmeier <hugh at mimosa.com>
Date:   Mon Apr 16 17:14:37 2018 -0400

    Tidy:
    
    - use struct initializers to advantage (lots more to be done)
    
    - replace most calls to zero() that initialized pointers since that is an error.
      Often with struct initializers.
      vfy_chain_pkix() still has questionable calls to zero().
    
    - shrink the scope of some variables.
      Often combining definition with first or only assignment.
    
    - sprinkle some "const" attributes
    
    - simplify some control structures
    
    - add or improve some comments
    
    - unwind peculiar structure of ikev2_addr_change().